At this point and still prior to docking, it is also important to identify the ureters, the sacral promontory, the midline with the sigmoid retracted, the middle sacral
vessels, and the iliac vessels.
SUMMARY: The objective of this study was to describe the anatomy of the opossum abdominal aorta sacral rami, emphasizing the common iliac arteries, external and internal iliac arteries and the middle sacral artery.
The middle sacral artery presented in 30% of cases now caudally rising from the right common iliac artery, then from the left one (30%) or in most cases (40%), as a continuation of the abdominal aorta artery.
Favre (1967), however, studying the guinea pig arterial system, concluded that the aorta ends in the same way it occurs in hamster and man, where the middle sacral artery emerges from and the external and internal iliac arteries bifurcate.
Arruda (1922) studied the armadillo, describing that after the bifurcations which originate the external and internal iliac arteries, the aorta runs like middle sacral artery, giving off small vessels.
The middle sacral artery, however, arose now from the right common iliac artery in (30% of cases), then from the left one (30% of cases) and in 40% of cases, it presented caudally continued the abdominal aorta.